21020112122 has 48 divisors (see below), whose sum is σ = 32888910600. Its totient is φ = 10071696000.

The previous prime is 21020112103. The next prime is 21020112161. The reversal of 21020112122 is 22121102012.

It can be written as a sum of positive squares in 4 ways, for example, as 13928956441 + 7091155681 = 118021^2 + 84209^2 .

It is a super-2 number, since 2×21020112122² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020112097 and 21020112106.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141074504 + ... + 141074652.

Almost surely, 2^21020112122 is an apocalyptic number.

21020112122 is a deficient number, since it is larger than the sum of its proper divisors (11868798478).

21020112122 is a wasteful number, since it uses less digits than its factorization.

21020112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020112122 its reverse (22121102012), we get a palindrome (43141214134).

The spelling of 21020112122 in words is "twenty-one billion, twenty million, one hundred twelve thousand, one hundred twenty-two".